Yes it can be replaced but there are different sizes in the thickness of it. The OP needs to find out the thickness and order the right size.
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The original CZ fiber is 1mm or, roughly, 0.040 inches
CZ-Parts.com sells a CZ front site that is 1.5mm (~0.060 inches). CZ Customs may also.
Dawson Precision sells fiber sticks in red and green in both sizes.
The fiber is easily replaced. Brownell's has a very good & short video on replacing. Easy to do on the range, if necessary.
I use the 1.5mm front sight with green fiber and have a gunsmith swap the sights for me. Sight replacement is an end-user task.
HTH